But gigantic leaves aren't Hawaii's only invasive problem. As the most isolated land mass on Earth, most of the native plant and animal population evolved without many of the world's more competitive and predatory species. In short, Hawaii's native species are more gentle than others, leaving them vulnerable to the "meaner" species that are only just being introduced to the islands.

Hawaii's Invasive Species Might Be Cute, But They're A Huge Island Threat

10 Invasive Species

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Cane Toads

Cane toads were <a href="http://animals.nationalgeographic.com/animals/amphibians/cane-toad/#">introduced into the Australian wild</a> in 1935 in an attempt to control cane beetles, pests that destroyed sugar cane plantations in the country. Unfortunately, the flying cane beetles didn't make for easy prey and the effort to control them failed.
The government released 102 toads from Hawaii into plantations north of Queensland and there are now an estimated 1.5 billion in Australia. They're about <a href="http://australianmuseum.net.au/Cane-Toad">the size of a softball</a>, excrete poison from their skin, and have been known to steal pet food.